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bugfix, sprites adjustment
[picodrive.git] / platform / gizmondo / emu.c
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1#include <windows.h>
2#include <string.h>
3
4#include <sys/stat.h> // mkdir
5#include <sys/types.h>
6
7#include "kgsdk/Framework.h"
8#include "kgsdk/Framework2D.h"
9#include "kgsdk/FrameworkAudio.h"
10#include "../common/emu.h"
11#include "../common/lprintf.h"
12#include "../common/arm_utils.h"
13#include "emu.h"
14#include "menu.h"
15#include "giz.h"
16#include "asm_utils.h"
17
18#include <Pico/PicoInt.h>
19
20#ifdef BENCHMARK
21#define OSD_FPS_X 220
22#else
23#define OSD_FPS_X 260
24#endif
25
26// main 300K gfx-related buffer. Used by menu and renderers.
27unsigned char gfx_buffer[321*240*2*2];
28char romFileName[MAX_PATH];
29int engineState;
30
31unsigned char *PicoDraw2FB = gfx_buffer; // temporary buffer for alt renderer ( (8+320)*(8+240+8) )
32int reset_timing = 0;
33
34static DWORD noticeMsgTime = 0;
35static short *snd_cbuff = NULL;
36static int snd_cbuf_samples = 0, snd_all_samples = 0;
37
38
39static void blit(const char *fps, const char *notice);
40static void clearArea(int full);
41
42void emu_noticeMsgUpdated(void)
43{
44 noticeMsgTime = GetTickCount();
45}
46
47void emu_getMainDir(char *dst, int len)
48{
49 if (len > 0) *dst = 0;
50}
51
52static void emu_msg_cb(const char *msg)
53{
54 if (giz_screen != NULL) Framework2D_UnlockBuffer();
55 giz_screen = Framework2D_LockBuffer(1);
56
57 memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
58 emu_textOut16(4, 232, msg);
59 noticeMsgTime = GetTickCount() - 2000;
60
61 /* assumption: emu_msg_cb gets called only when something slow is about to happen */
62 reset_timing = 1;
63
64 Framework2D_UnlockBuffer();
65 giz_screen = Framework2D_LockBuffer((currentConfig.EmuOpt&0x8000) ? 0 : 1);
66}
67
68void emu_stateCb(const char *str)
69{
70 if (giz_screen != NULL) Framework2D_UnlockBuffer();
71 giz_screen = Framework2D_LockBuffer(1);
72
73 clearArea(0);
74 blit("", str);
75
76 Framework2D_UnlockBuffer();
77 giz_screen = NULL;
78
79 Sleep(0); /* yield the CPU, the system may need it */
80}
81
82static void emu_msg_tray_open(void)
83{
84 strcpy(noticeMsg, "CD tray opened");
85 noticeMsgTime = GetTickCount();
86}
87
88
89void emu_Init(void)
90{
91 // make dirs for saves, cfgs, etc.
92 mkdir("mds", 0777);
93 mkdir("srm", 0777);
94 mkdir("brm", 0777);
95 mkdir("cfg", 0777);
96
97 PicoInit();
98 PicoMessage = emu_msg_cb;
99 PicoMCDopenTray = emu_msg_tray_open;
100 PicoMCDcloseTray = menu_loop_tray;
101}
102
103void emu_Deinit(void)
104{
105 // save SRAM
106 if ((currentConfig.EmuOpt & 1) && SRam.changed) {
107 emu_SaveLoadGame(0, 1);
108 SRam.changed = 0;
109 }
110
111 if (!(currentConfig.EmuOpt & 0x20))
112 config_writelrom(PicoConfigFile);
113
114 PicoExit();
115}
116
117void emu_setDefaultConfig(void)
118{
119 memset(&currentConfig, 0, sizeof(currentConfig));
120 currentConfig.lastRomFile[0] = 0;
121 currentConfig.EmuOpt = 0x1f | 0x680; // | confirm_save, cd_leds, 16bit rend
122 currentConfig.PicoOpt = 0x07 | 0xc00; // | cd_pcm, cd_cdda
123 currentConfig.PsndRate = 22050;
124 currentConfig.PicoRegion = 0; // auto
125 currentConfig.PicoAutoRgnOrder = 0x184; // US, EU, JP
126 currentConfig.Frameskip = -1; // auto
127 currentConfig.volume = 50;
128 currentConfig.KeyBinds[ 2] = 1<<0; // SACB RLDU
129 currentConfig.KeyBinds[ 3] = 1<<1;
130 currentConfig.KeyBinds[ 0] = 1<<2;
131 currentConfig.KeyBinds[ 1] = 1<<3;
132 currentConfig.KeyBinds[ 5] = 1<<4;
133 currentConfig.KeyBinds[ 6] = 1<<5;
134 currentConfig.KeyBinds[ 7] = 1<<6;
135 currentConfig.KeyBinds[ 4] = 1<<7;
136 currentConfig.KeyBinds[13] = 1<<26; // switch rend
137 currentConfig.KeyBinds[ 8] = 1<<27; // save state
138 currentConfig.KeyBinds[ 9] = 1<<28; // load state
139 currentConfig.KeyBinds[12] = 1<<29; // vol up
140 currentConfig.KeyBinds[11] = 1<<30; // vol down
141 currentConfig.PicoCDBuffers = 0;
142 currentConfig.scaling = 0;
143}
144
145
146static int EmuScanBegin16(unsigned int num)
147{
148 if (!(Pico.video.reg[1]&8)) num += 8;
149 DrawLineDest = (unsigned short *) giz_screen + 321 * num;
150
151 if ((currentConfig.EmuOpt&0x4000) && (num&1) == 0) // (Pico.m.frame_count&1))
152 return 1; // skip next line
153
154 return 0;
155}
156
157static int EmuScanBegin8(unsigned int num)
158{
159 // draw like the fast renderer
160 if (!(Pico.video.reg[1]&8)) num += 8;
161 HighCol = gfx_buffer + 328 * num;
162
163 return 0;
164}
165
166static void osd_text(int x, int y, const char *text)
167{
168 int len = strlen(text) * 8 / 2;
169 int *p, h;
170 for (h = 0; h < 8; h++) {
171 p = (int *) ((unsigned short *) giz_screen+x+321*(y+h));
172 p = (int *) ((int)p & ~3); // align
173 memset32(p, 0, len);
174 }
175 emu_textOut16(x, y, text);
176}
177
178/*
179void log1(void *p1, void *p2)
180{
181 lprintf("%p %p %p\n", p1, p2, DrawLineDest);
182}
183*/
184
185static void cd_leds(void)
186{
187 static int old_reg = 0;
188 unsigned int col_g, col_r, *p;
189
190 if (!((Pico_mcd->s68k_regs[0] ^ old_reg) & 3)) return; // no change
191 old_reg = Pico_mcd->s68k_regs[0];
192
193 p = (unsigned int *)((short *)giz_screen + 321*2+4+2);
194 col_g = (old_reg & 2) ? 0x06000600 : 0;
195 col_r = (old_reg & 1) ? 0xc000c000 : 0;
196 *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r; p += 321/2 - 12/2 + 1;
197 *p++ = col_g; p+=3; *p++ = col_r; p += 321/2 - 10/2;
198 *p++ = col_g; *p++ = col_g; p+=2; *p++ = col_r; *p++ = col_r;
199}
200
201
202static short localPal[0x100];
203
204static void blit(const char *fps, const char *notice)
205{
206 int emu_opt = currentConfig.EmuOpt;
207
208 if (PicoOpt&0x10)
209 {
210 int lines_flags = 224;
211 // 8bit fast renderer
212 if (Pico.m.dirtyPal) {
213 Pico.m.dirtyPal = 0;
214 vidConvCpyRGB565(localPal, Pico.cram, 0x40);
215 }
216 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
217 if (currentConfig.EmuOpt&0x4000)
218 lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
219 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
220 }
221 else if (!(emu_opt&0x80))
222 {
223 int lines_flags;
224 // 8bit accurate renderer
225 if (Pico.m.dirtyPal) {
226 Pico.m.dirtyPal = 0;
227 vidConvCpyRGB565(localPal, Pico.cram, 0x40);
228 if (Pico.video.reg[0xC]&8) { // shadow/hilight mode
229 //vidConvCpyRGB32sh(localPal+0x40, Pico.cram, 0x40);
230 //vidConvCpyRGB32hi(localPal+0x80, Pico.cram, 0x40); // TODO?
231 blockcpy(localPal+0xc0, localPal+0x40, 0x40*2);
232 localPal[0xc0] = 0x0600;
233 localPal[0xd0] = 0xc000;
234 localPal[0xe0] = 0x0000; // reserved pixels for OSD
235 localPal[0xf0] = 0xffff;
236 }
237 /* no support
238 else if (rendstatus & 0x20) { // mid-frame palette changes
239 vidConvCpyRGB565(localPal+0x40, HighPal, 0x40);
240 vidConvCpyRGB565(localPal+0x80, HighPal+0x40, 0x40);
241 } */
242 }
243 lines_flags = (Pico.video.reg[1]&8) ? 240 : 224;
244 if (!(Pico.video.reg[12]&1)) lines_flags|=0x10000;
245 if (currentConfig.EmuOpt&0x4000)
246 lines_flags|=0x40000; // (Pico.m.frame_count&1)?0x20000:0x40000;
247 vidCpy8to16((unsigned short *)giz_screen+321*8, PicoDraw2FB+328*8, localPal, lines_flags);
248 }
249
250 if (notice || (emu_opt & 2)) {
251 int h = 232;
252 if (notice) osd_text(4, h, notice);
253 if (emu_opt & 2) osd_text(OSD_FPS_X, h, fps);
254 }
255
256 if ((emu_opt & 0x400) && (PicoAHW & PAHW_MCD))
257 cd_leds();
258}
259
260// clears whole screen or just the notice area (in all buffers)
261static void clearArea(int full)
262{
263 if (giz_screen == NULL)
264 giz_screen = Framework2D_LockBuffer(1);
265 if (full) memset32(giz_screen, 0, 320*240*2/4);
266 else memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
267
268 if (currentConfig.EmuOpt&0x8000) {
269 Framework2D_UnlockBuffer();
270 giz_screen = Framework2D_LockBuffer(0);
271 if (full) memset32(giz_screen, 0, 320*240*2/4);
272 else memset32((int *)((char *)giz_screen + 321*232*2), 0, 321*8*2/4);
273 }
274}
275
276static void vidResetMode(void)
277{
278 giz_screen = Framework2D_LockBuffer(1);
279
280 if (PicoOpt&0x10) {
281 } else if (currentConfig.EmuOpt&0x80) {
282 PicoDrawSetColorFormat(1);
283 PicoScanBegin = EmuScanBegin16;
284 } else {
285 PicoDrawSetColorFormat(-1);
286 PicoScanBegin = EmuScanBegin8;
287 }
288 if ((PicoOpt&0x10) || !(currentConfig.EmuOpt&0x80)) {
289 // setup pal for 8-bit modes
290 localPal[0xc0] = 0x0600;
291 localPal[0xd0] = 0xc000;
292 localPal[0xe0] = 0x0000; // reserved pixels for OSD
293 localPal[0xf0] = 0xffff;
294 }
295 Pico.m.dirtyPal = 1;
296
297 memset32(giz_screen, 0, 321*240*2/4);
298 if (currentConfig.EmuOpt&0x8000) {
299 Framework2D_UnlockBuffer();
300 giz_screen = Framework2D_LockBuffer(0);
301 memset32(giz_screen, 0, 321*240*2/4);
302 }
303 Framework2D_UnlockBuffer();
304 giz_screen = NULL;
305}
306
307/*
308#include <stdarg.h>
309static void stdbg(const char *fmt, ...)
310{
311 static int cnt = 0;
312 va_list vl;
313
314 sprintf(noticeMsg, "%x ", cnt++);
315 va_start(vl, fmt);
316 vsnprintf(noticeMsg+strlen(noticeMsg), sizeof(noticeMsg)-strlen(noticeMsg), fmt, vl);
317 va_end(vl);
318
319 noticeMsgTime = GetTickCount();
320}
321*/
322
323static void updateSound(int len)
324{
325 if (PicoOpt&8) len<<=1;
326
327 snd_all_samples += len;
328 PsndOut += len;
329 if (PsndOut - snd_cbuff >= snd_cbuf_samples)
330 {
331 //if (PsndOut - snd_cbuff != snd_cbuf_samples)
332 // stdbg("snd diff is %i, not %i", PsndOut - snd_cbuff, snd_cbuf_samples);
333 PsndOut = snd_cbuff;
334 }
335}
336
337
338static void SkipFrame(void)
339{
340 PicoSkipFrame=1;
341 PicoFrame();
342 PicoSkipFrame=0;
343}
344
345/* forced frame to front buffer */
346void emu_forcedFrame(int opts)
347{
348 int po_old = PicoOpt;
349 int eo_old = currentConfig.EmuOpt;
350
351 PicoOpt &= ~0x10;
352 PicoOpt |= opts|POPT_ACC_SPRITES;
353 currentConfig.EmuOpt |= 0x80;
354
355 if (giz_screen == NULL)
356 giz_screen = Framework2D_LockBuffer(1);
357
358 PicoDrawSetColorFormat(1);
359 PicoScanBegin = EmuScanBegin16;
360 Pico.m.dirtyPal = 1;
361 PicoFrameDrawOnly();
362
363 Framework2D_UnlockBuffer();
364 giz_screen = NULL;
365
366 PicoOpt = po_old;
367 currentConfig.EmuOpt = eo_old;
368}
369
370
371static void RunEvents(unsigned int which)
372{
373 if (which & 0x1800) // save or load (but not both)
374 {
375 int do_it = 1;
376
377 if (PsndOut != NULL)
378 FrameworkAudio_SetPause(1);
379 if (giz_screen == NULL)
380 giz_screen = Framework2D_LockBuffer(1);
381 if ( emu_checkSaveFile(state_slot) &&
382 (( (which & 0x1000) && (currentConfig.EmuOpt & 0x800)) || // load
383 (!(which & 0x1000) && (currentConfig.EmuOpt & 0x200))) ) // save
384 {
385 int keys;
386 blit("", (which & 0x1000) ? "LOAD STATE? (PLAY=yes, STOP=no)" : "OVERWRITE SAVE? (PLAY=yes, STOP=no)");
387 while( !((keys = Framework_PollGetButtons()) & (BTN_PLAY|BTN_STOP)) )
388 Sleep(50);
389 if (keys & BTN_STOP) do_it = 0;
390 while( ((keys = Framework_PollGetButtons()) & (BTN_PLAY|BTN_STOP)) ) // wait for release
391 Sleep(50);
392 clearArea(0);
393 }
394
395 if (do_it)
396 {
397 osd_text(4, 232, (which & 0x1000) ? "LOADING GAME" : "SAVING GAME");
398 PicoStateProgressCB = emu_stateCb;
399 emu_SaveLoadGame((which & 0x1000) >> 12, 0);
400 PicoStateProgressCB = NULL;
401 Sleep(0);
402 }
403
404 if (PsndOut != NULL)
405 FrameworkAudio_SetPause(0);
406 reset_timing = 1;
407 }
408 if (which & 0x0400) // switch renderer
409 {
410 if (PicoOpt&0x10) { PicoOpt&=~0x10; currentConfig.EmuOpt |= 0x80; }
411 else { PicoOpt|= 0x10; currentConfig.EmuOpt &= ~0x80; }
412
413 vidResetMode();
414
415 if (PicoOpt&0x10) {
416 strcpy(noticeMsg, " 8bit fast renderer");
417 } else if (currentConfig.EmuOpt&0x80) {
418 strcpy(noticeMsg, "16bit accurate renderer");
419 } else {
420 strcpy(noticeMsg, " 8bit accurate renderer");
421 }
422
423 noticeMsgTime = GetTickCount();
424 }
425 if (which & 0x0300)
426 {
427 if(which&0x0200) {
428 state_slot -= 1;
429 if(state_slot < 0) state_slot = 9;
430 } else {
431 state_slot += 1;
432 if(state_slot > 9) state_slot = 0;
433 }
434 sprintf(noticeMsg, "SAVE SLOT %i [%s]", state_slot, emu_checkSaveFile(state_slot) ? "USED" : "FREE");
435 noticeMsgTime = GetTickCount();
436 }
437}
438
439static void updateKeys(void)
440{
441 unsigned int keys, allActions[2] = { 0, 0 }, events;
442 static unsigned int prevEvents = 0;
443 int i;
444
445 keys = Framework_PollGetButtons();
446 if (keys & BTN_HOME)
447 engineState = PGS_Menu;
448
449 keys &= CONFIGURABLE_KEYS;
450
451 for (i = 0; i < 32; i++)
452 {
453 if (keys & (1 << i))
454 {
455 int pl, acts = currentConfig.KeyBinds[i];
456 if (!acts) continue;
457 pl = (acts >> 16) & 1;
458 if (kb_combo_keys & (1 << i))
459 {
460 int u = i+1, acts_c = acts & kb_combo_acts;
461 // let's try to find the other one
462 if (acts_c) {
463 for (; u < 32; u++)
464 if ( (keys & (1 << u)) && (currentConfig.KeyBinds[u] & acts_c) ) {
465 allActions[pl] |= acts_c & currentConfig.KeyBinds[u];
466 keys &= ~((1 << i) | (1 << u));
467 break;
468 }
469 }
470 // add non-combo actions if combo ones were not found
471 if (!acts_c || u == 32)
472 allActions[pl] |= acts & ~kb_combo_acts;
473 } else {
474 allActions[pl] |= acts;
475 }
476 }
477 }
478
479 PicoPad[0] = (unsigned short) allActions[0];
480 PicoPad[1] = (unsigned short) allActions[1];
481
482 events = (allActions[0] | allActions[1]) >> 16;
483
484 // volume is treated in special way and triggered every frame
485 if ((events & 0x6000) && PsndOut != NULL)
486 {
487 int vol = currentConfig.volume;
488 if (events & 0x2000) {
489 if (vol < 100) vol++;
490 } else {
491 if (vol > 0) vol--;
492 }
493 FrameworkAudio_SetVolume(vol, vol);
494 sprintf(noticeMsg, "VOL: %02i ", vol);
495 noticeMsgTime = GetTickCount();
496 currentConfig.volume = vol;
497 }
498
499 events &= ~prevEvents;
500 if (events) RunEvents(events);
501 if (movie_data) emu_updateMovie();
502
503 prevEvents = (allActions[0] | allActions[1]) >> 16;
504}
505
506
507static void simpleWait(DWORD until)
508{
509 DWORD tval;
510 int diff;
511
512 tval = GetTickCount();
513 diff = (int)until - (int)tval;
514 if (diff >= 2)
515 Sleep(diff - 1);
516
517 while ((tval = GetTickCount()) < until && until - tval < 512) // some simple overflow detection
518 spend_cycles(1024*2);
519}
520
521void emu_Loop(void)
522{
523 static int PsndRate_old = 0, PicoOpt_old = 0, pal_old = 0;
524 char fpsbuff[24]; // fps count c string
525 DWORD tval, tval_prev = 0, tval_thissec = 0; // timing
526 int frames_done = 0, frames_shown = 0, oldmodes = 0, sec_ms = 1000;
527 int target_fps, target_frametime, lim_time, tval_diff, i;
528 char *notice = NULL;
529
530 lprintf("entered emu_Loop()\n");
531
532 fpsbuff[0] = 0;
533
534 // make sure we are in correct mode
535 vidResetMode();
536 if (currentConfig.scaling) PicoOpt|=0x4000;
537 else PicoOpt&=~0x4000;
538 Pico.m.dirtyPal = 1;
539 oldmodes = ((Pico.video.reg[12]&1)<<2) ^ 0xc;
540 emu_findKeyBindCombos();
541
542 // pal/ntsc might have changed, reset related stuff
543 target_fps = Pico.m.pal ? 50 : 60;
544 target_frametime = Pico.m.pal ? (1000<<8)/50 : (1000<<8)/60+1;
545 reset_timing = 1;
546
547 // prepare CD buffer
548 if (PicoAHW & PAHW_MCD) PicoCDBufferInit();
549
550 // prepare sound stuff
551 PsndOut = NULL;
552 if (currentConfig.EmuOpt & 4)
553 {
554 int ret, snd_excess_add, stereo;
555 if (PsndRate != PsndRate_old || (PicoOpt&0x0b) != (PicoOpt_old&0x0b) || Pico.m.pal != pal_old) {
556 PsndRerate(Pico.m.frame_count ? 1 : 0);
557 }
558 stereo=(PicoOpt&8)>>3;
559 snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
560 snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
561 lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
562 PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
563 ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
564 if (ret != 0) {
565 lprintf("FrameworkAudio_Init() failed: %i\n", ret);
566 sprintf(noticeMsg, "sound init failed (%i), snd disabled", ret);
567 noticeMsgTime = GetTickCount();
568 currentConfig.EmuOpt &= ~4;
569 } else {
570 FrameworkAudio_SetVolume(currentConfig.volume, currentConfig.volume);
571 PicoWriteSound = updateSound;
572 snd_cbuff = FrameworkAudio_56448Buffer();
573 PsndOut = snd_cbuff + snd_cbuf_samples / 2; // start writing at the middle
574 snd_all_samples = 0;
575 PsndRate_old = PsndRate;
576 PicoOpt_old = PicoOpt;
577 pal_old = Pico.m.pal;
578 }
579 }
580
581 // loop?
582 while (engineState == PGS_Running)
583 {
584 int modes;
585
586 tval = GetTickCount();
587 if (reset_timing || tval < tval_prev) {
588 //stdbg("timing reset");
589 reset_timing = 0;
590 tval_thissec = tval;
591 frames_shown = frames_done = 0;
592 }
593
594 // show notice message?
595 if (noticeMsgTime) {
596 static int noticeMsgSum;
597 if (tval - noticeMsgTime > 2000) { // > 2.0 sec
598 noticeMsgTime = 0;
599 clearArea(0);
600 notice = 0;
601 } else {
602 int sum = noticeMsg[0]+noticeMsg[1]+noticeMsg[2];
603 if (sum != noticeMsgSum) { clearArea(0); noticeMsgSum = sum; }
604 notice = noticeMsg;
605 }
606 }
607
608 // check for mode changes
609 modes = ((Pico.video.reg[12]&1)<<2)|(Pico.video.reg[1]&8);
610 if (modes != oldmodes) {
611 oldmodes = modes;
612 clearArea(1);
613 }
614
615 // second passed?
616 if (tval - tval_thissec >= sec_ms)
617 {
618#ifdef BENCHMARK
619 static int bench = 0, bench_fps = 0, bench_fps_s = 0, bfp = 0, bf[4];
620 if(++bench == 10) {
621 bench = 0;
622 bench_fps_s = bench_fps;
623 bf[bfp++ & 3] = bench_fps;
624 bench_fps = 0;
625 }
626 bench_fps += frames_shown;
627 sprintf(fpsbuff, "%02i/%02i/%02i", frames_shown, bench_fps_s, (bf[0]+bf[1]+bf[2]+bf[3])>>2);
628#else
629 if(currentConfig.EmuOpt & 2)
630 sprintf(fpsbuff, "%02i/%02i", frames_shown, frames_done);
631#endif
632 //tval_thissec += 1000;
633 tval_thissec += sec_ms;
634
635 if (PsndOut != NULL)
636 {
637 /* some code which tries to sync things to audio clock, the dirty way */
638 static int audio_skew_prev = 0;
639 int audio_skew, adj, co = 9, shift = 7;
640 audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
641 if (PsndRate == 22050) co = 10;
642 if (PsndRate > 22050) co = 11;
643 if (PicoOpt&8) shift++;
644 if (audio_skew < 0) {
645 adj = -((-audio_skew) >> shift);
646 if (audio_skew > -(6<<co)) adj>>=1;
647 if (audio_skew > -(4<<co)) adj>>=1;
648 if (audio_skew > -(2<<co)) adj>>=1;
649 if (audio_skew > audio_skew_prev) adj>>=2; // going up already
650 } else {
651 adj = audio_skew >> shift;
652 if (audio_skew < (6<<co)) adj>>=1;
653 if (audio_skew < (4<<co)) adj>>=1;
654 if (audio_skew < (2<<co)) adj>>=1;
655 if (audio_skew < audio_skew_prev) adj>>=2;
656 }
657 audio_skew_prev = audio_skew;
658 target_frametime += adj;
659 sec_ms = (target_frametime * target_fps) >> 8;
660 //stdbg("%i %i %i", audio_skew, adj, sec_ms);
661 frames_done = frames_shown = 0;
662 }
663 else if (currentConfig.Frameskip < 0) {
664 frames_done -= target_fps; if (frames_done < 0) frames_done = 0;
665 frames_shown -= target_fps; if (frames_shown < 0) frames_shown = 0;
666 if (frames_shown > frames_done) frames_shown = frames_done;
667 } else {
668 frames_done = frames_shown = 0;
669 }
670 }
671#ifdef PFRAMES
672 sprintf(fpsbuff, "%i", Pico.m.frame_count);
673#endif
674
675 tval_prev = tval;
676 lim_time = (frames_done+1) * target_frametime;
677 if (currentConfig.Frameskip >= 0) // frameskip enabled
678 {
679 for (i = 0; i < currentConfig.Frameskip; i++) {
680 updateKeys();
681 SkipFrame(); frames_done++;
682 if (PsndOut) { // do framelimitting if sound is enabled
683 int tval_diff;
684 tval = GetTickCount();
685 tval_diff = (int)(tval - tval_thissec) << 8;
686 if (tval_diff < lim_time) // we are too fast
687 simpleWait(tval + ((lim_time - tval_diff)>>8));
688 }
689 lim_time += target_frametime;
690 }
691 }
692 else // auto frameskip
693 {
694 int tval_diff;
695 tval = GetTickCount();
696 tval_diff = (int)(tval - tval_thissec) << 8;
697 if (tval_diff > lim_time)
698 {
699 // no time left for this frame - skip
700 if (tval_diff - lim_time >= (300<<8)) {
701 /* something caused a slowdown for us (disk access? cache flush?)
702 * try to recover by resetting timing... */
703 reset_timing = 1;
704 continue;
705 }
706 updateKeys();
707 SkipFrame(); frames_done++;
708 continue;
709 }
710 }
711
712 updateKeys();
713
714 if (currentConfig.EmuOpt&0x80)
715 /* be sure correct framebuffer is locked */
716 giz_screen = Framework2D_LockBuffer((currentConfig.EmuOpt&0x8000) ? 0 : 1);
717
718 PicoFrame();
719
720 if (giz_screen == NULL)
721 giz_screen = Framework2D_LockBuffer((currentConfig.EmuOpt&0x8000) ? 0 : 1);
722
723 blit(fpsbuff, notice);
724
725 if (giz_screen != NULL) {
726 Framework2D_UnlockBuffer();
727 giz_screen = NULL;
728 }
729
730 if (currentConfig.EmuOpt&0x2000)
731 Framework2D_WaitVSync();
732
733 if (currentConfig.EmuOpt&0x8000)
734 Framework2D_Flip();
735
736 // check time
737 tval = GetTickCount();
738 tval_diff = (int)(tval - tval_thissec) << 8;
739
740 if (currentConfig.Frameskip < 0 && tval_diff - lim_time >= (300<<8)) // slowdown detection
741 reset_timing = 1;
742 else if (PsndOut != NULL || currentConfig.Frameskip < 0)
743 {
744 // sleep if we are still too fast
745 if (tval_diff < lim_time)
746 {
747 // we are too fast
748 simpleWait(tval + ((lim_time - tval_diff) >> 8));
749 }
750 }
751
752 frames_done++; frames_shown++;
753 }
754
755
756 if (PicoAHW & PAHW_MCD) PicoCDBufferFree();
757
758 if (PsndOut != NULL) {
759 PsndOut = snd_cbuff = NULL;
760 FrameworkAudio_Close();
761 }
762
763 // save SRAM
764 if ((currentConfig.EmuOpt & 1) && SRam.changed) {
765 emu_stateCb("Writing SRAM/BRAM..");
766 emu_SaveLoadGame(0, 1);
767 SRam.changed = 0;
768 }
769}
770
771
772void emu_ResetGame(void)
773{
774 PicoReset();
775 reset_timing = 1;
776}
777
fast MegaDrive/MegaCD/32X emulator